Method of and system for utilizing heat



@Qih 23, 1923.

I A. BESTA ET AL METHOD OFAND SYSTEM FOR UTILIZING HEAT Filed March 19.1923 Patented Get. 233, i923,

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EETIBZQID AND SYSTEM FOR UTILIZING- HEAT.

Application filed march 1a, was. Serial no. eaaoao.

To all whom it may concern:

Be it known that we, AnALeEn'r Been, a citizen of Germany, residing atDuisburg- Ruhrort, in the State of Prussia, Germany,

0 and HnrNmorr LENT, a citizen of Germany, residing atDuisburg-Ruhro'rt, in the State of Prussia, Germany, have inventedcertain new and useful Improvements in the Methods of and Systems forUtilizing Heat; and

it) we do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Our invention relates to improvements in the method of and system forutilizing heat. More particularly our invention relates to systems inwhich the ratio of the heat supplied by a source thereof and the demandat for heat varies, and in which the supply or the demand of heat orboth vary during a certain period of time for example during a day, sothat during a part of the day the supply of the heat exceeds the demand,

while during other arts it is insufficient to cover the demand. xamplcsof systems of this class are metallurgical plants in which the as fromblast furnaces or other metallurgical furnaces is used for heating steam$10 boilers supplying steam to the engines or other consumers of theplant. As is known to those skilled in the art the supply of gas fromblast furnaces varies in the course of a day within large limits, sothat there is temporarily an excess of heat while at other times thesupply is insuflicient. On the other hand the consumption of steam isirregular and it varies within large limits, and it happens thatmuch'steam is required at a 40 time when the supply of gas is low, andvice versa. Economical running of the plant requires that the excess anddeficiency of heat supplied and consumed are compensated, so that at notime is there a deficiency of as steam, and so that there is no waste ofheat by allowing the gas to escape without being used for the purposesof the plant. Therefore, our invention consists in connecting a steamgenerating plant with a hot water heat accumulator, and connecting thegas supply with the generator as well as with the accumulator, the gasbeing supplied to both of said apparatuses if the supply thereof islarge and exceeds that of the demand, while the gas supply to theaccumulator is reduced or entirely interrupted, and the gas is conductedonly to the boiler, when the supply of gas is reduced. When the gas isnot sufficient to generate the amount of steam required in the plant thehot water from the accumulator is fed into the boiler.

in order that our invention be more clearly understood an exampleembodying the same has been shown in the accompanying drawingillustrating our improved system in a diagrammatical Way. In the exampleshown in the figure our improved system comprises a steam generator b ofany known or preferred construction having burners Z connected with thesupply of gas from a metallurgical furnace such as a blast furnace, anda superheater 7c. -Preferably the'fire box contains a checker work z'.The steam generator is connected with a hot water accumulator made inseveral sections a each-comprising two boilers havmg upper and lowerboiler sections 0 and 0'. Within each of the lower boiler sections thereare two fiues m containing suitable burners n and a checker work 0- forstoring heat. The lower boiler sections 0 are connected by pipes 03, andthey communicate with the water chamber of the steam generator I)through a pipe 6 including a feed water pump f. The domes g of theaccumulator communicate with the steam generator and preferably with thesuperheater lc thereof through a pipe h. It will be understood by thoseskilled in the art that by reason of the communication between the domesg of the accumulator and the boiler, the same pressure at any momentobtains in said accumulator and said boiler.

The burners Z and n are connected with the gas supply by pipes p and gand amain 1', which pipes include valves 8 and t controlling the fuelsupply to the individual accumulator sections and the boiler.

If the supply of gas from the blast furnace is high, the gas is burnedin the boiler and in the accumulator, and the heat is used forgenerating steam in the boiler and heating the checker works 0 and 2'and the water within the accumulator. Upon a reduction of the as supplythe burners n are successively s ut oil from the supply, and finally thewhole volume of gas is burnt within the generator 6. Now the heat storedin the hot water of the accumulator a is transmitted to the boilerthrough the pipe 6, and as the level of the water within the accumulatorfalls ofi' the feed pump f is put into opera- I tion. Now the heatsupplied to the boiler ter' into the boiler, the heat stored in thechecker work 0 is sufficient to generate steam within the accumulator,which steam flows through pipe 7:. to the generator I) and moreparticularly to the superheater is there- The operation is similar ifthe consumption of steam varies. In case of a reduced consumption theheat which is not immediately necessary for generating steam is used forheating water within the accumulator, and the heat stored in theaccumulator is afterwards transmitted to theboiler.

It will be understood that cold water is fed into the accumulator at orbefore the period of a high supply of heating gas. The level of thewater in the accumulator may rise above that of the water in thegenerator, and at the time of a reduced gas supply the level within theaccumulator may fall off far below that of the generator. Thereforethere is a large volume of water for storing heat. The difiierence ofthe level of the water within the accumulator is not objectionable byreason of the feed pump f adapted to force the water i to the boilerwhen the level in the accumu ator is low, and to prevent non-regulatedsupply of water to the boiler when said level is high.

In the figures we have shown hand operated means 'for controlling thesupply of gas to the burners, but we wish it to be understood that ourinvention is not limited to this feature.

While in describing theinvention referonce has been made to a particularapparatus which is suitable for putting the method into effect, we wishit to be understood that our invention is not limited to theconstruction of the apparatus shown in the drawing and that variouschanges may be made in the general arrangement of the apparatus and theconstruction of its parts without departing from our invention.

We claim:

1. In a system for utilizing waste heat a steam generator having aburner for heating same, a source of fluctuating combustible gas supply,valve controlled means for conducting gas from said source to saidgenerator burner, an accumulator having a burner for storing up heatunits from said gas supply when said supply exceeds the demands of saidgenerator, valve controlled by-pass means for leading such excess gasfrom said source to said accumulator burner unmixed with the gas whichhas been burned in said generator burner, said accumulator comprising awater heater, and

means for delivering water from said aogas su ply when said supplyexceeds the man s of said generator, valve controlled by-pass means forleading such excess gas from said source to said accumulator burnerunmixed with the gas which has been burned in said generator burner,said accumulator comprising a water heater, and means for deliveringwater from said accumulator to said steam generator, said water deliverymeans including means for controlling the supply of water from saidaccumulator to said generator.

3. In a system for utilizing Waste heat a steam generator having aburner ior heating same, a source of fluctuating combustible gas supply,valve controlled means for conducting gas from said source to saidgenerator burner, an accumulator having a burner for storing up heatunits from said gas supply when said supply exceeds the demands of saidgenerator, valve controlled by-pass means for leading such excess gasfrom said source to said accumulator burner unmixed with the gas whichhas-been burned in said generator burner, said accumulator comprising awater heater, and means for delivering water from said accumulator tosaid steam generator, said water delivery means including means forselectively forcing water from said accumulator to said generator andfor preventin non-regulated supply ofwater from sai accumulator to saidgenerator.

4. In a system for utilizing waste heat a steam generator having aburner for heating same, a source of fluctuating combustible gas supply,valve controlled means for conducting gas from said source to saidgenerator burner, an accumulator having a burner for storing up heatunits from said gas supply when said supply exceeds the demands of saidgenerator, valve controlled by-pass means for leading such excess gasfrom said source to said accumulator burner unmixed with the gas whichhas been burned in said generator burner, said accumulator comprising awater heater, means for delivering water from said accumulator to saidsteam generator, and steam delivery means connecting said accumulatorwith said generator.

5. The method of utilizing the heat in a fluctuating combustible gassupply which mariner.

tuating supply when said supply is suffi cient for so doin andby-passing the excess of said supp y over said demands to the burner ofsaid accumulator to heat the water in said accumulator, keeping the gassupplied to said accumulator burner unmixed with the spent gas burned insaid generator burner, and, when said supply is insutlicient to 'meetthe demands of said generator, delivering hot water from saidaccumulator to said generator.

6. The method of utilizing the heat in a fluctuating combustible gassupply which consists in providing a steam generator having a burner,and an accumulate having a burner, said accumulator comprising a waterheater, supplying the demands of said steam generator burner from saidfluctuatin suppl when said supply is sufiicient or so oin andby-pa'ssing the excess of said-supp y over said demands to the burner ofsaid accumulator to heat the water in said accumulator, keeping the gassupplied to said accumulator burner unmixedwith the spent gas burned insaid generator burner, and, when said supply is insufiicient to meetthedemands of said generator, delivering hot water from said accumulatorto said generator at the pressure and temperature within said generator.

7. The method of utilizing the heat in a fluctuating combustible gassupply which consists in providing a steam generator having a burner tobe provided-with gas from said supply and by-passing excess gas over andabove the demands of said generator to the burner of an accumulator,keeping the gas supplied to said accumulator burner unmixed with thespent gas burned in said generator burner, and, when said gas supply isinsufiicient to meet the demands of said generator, delivering hot waterfrom said accumulator to sald generator.

8. The method of utilizing the heatvin a fluctuating combustible gassupply which consists in providing a steam generator having a burner tobe provided with gas from said supply and by-passing excess gas overandabove the demands of said generator to the burner of an accumulator,keeping the gas supplied to said accumula tor burner unmixed with thespent gas burned in said generator burner, preventin an unregulatedsupply of water from sai accumulator to said generator while heat unitsare being stored up in said accumulator, and, when said gas supply isinsufficient to meet the demands of said generator, delivering hot waterfrom said accumulator to said generator, 7

. In testimony whereof we hereunto afix our signatures in the presenceof two witnesses.

ADALBERT BESTA. HEINR. LENT. Witnesses:

Henry W. Haas, P nine

